Azo dye compd.

2,7-Naphthalenedisulfonic acid, 4-amino-6-4-4-(2,4-dihydroxyphenyl)azophenylaminosulfonylphenylazo-5-hydroxy-3-(4-nitrophenyl)azo-, potassium salt

4-amino-6-[[4-[[[4-[(2,4-dihydroxyphenyl)azo]phenyl]amino]sulphonyl]phenyl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]naphthalene-2,7-disulphonic acid, potassium salt

4-Amino-6-[[4-[[[4-[(2,4-dihydroxyphenyl)azo]phenyl]amino]sulfonyl]phenyl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]-2,7-naphthalenedisulfonic acid/potassium,(1:x) salt